Endress+Hauser Proline Promass I 100 - Diagnostics and Troubleshooting; General Troubleshooting

Proline Promass I 100 Modbus RS485 Diagnostics and troubleshooting
Endress+Hauser 61
12 Diagnostics and troubleshooting
12.1 General troubleshooting
For output signals
Problem Possible causes Remedy
Green power LED on the main
electronics module of the
transmitter is dark
Supply voltage does not match that
specified on the nameplate.
Apply the correct supply voltage
(  30).
Green power LED on the main
electronics module of the
transmitter is dark
Power supply cable connected
incorrectly
Check the terminal assignment .
Green power LED on Safety Barrier
Promass 100 is dark
Supply voltage does not match that
specified on the nameplate.
Apply the correct supply voltage
(  30).
Green power LED on Safety Barrier
Promass 100 is dark
Power supply cable connected
incorrectly
Check the terminal assignment
(  28).
Device measures incorrectly. Configuration error or device is
operated outside the application.
1. Check and correct parameter
configuration.
2. Observe limit values specified in
the "Technical Data".
For access
Problem Possible causes Remedy
No write access to parameters Hardware write protection enabled Set the write protection switch on
the main electronics module to the
OFF position (  55).
No connection via Modbus RS485 Modbus RS485 bus cable connected
incorrectly
Check the terminal assignment .
No connection via Modbus RS485 Device plug connected incorrectly Check the pin assignment of the
device plug (  28).
No connection via Modbus RS485 Modbus RS485 cable incorrectly
terminated
Check terminating resistor
(  32).
No connection via Modbus RS485 Incorrect settings for the
communication interface
Check the Modbus RS485
configuration (  47).
No connection via service interface Incorrect configuration of USB
interface on PC or driver not
installed correctly.
Observe the documentation for the
Commubox.
FXA291: Document
"Technical Information"
TI00405C
12.2 Diagnostic information via light emitting diodes
12.2.1 Transmitter
Various light emitting diodes (LEDs) on the main electronics module of the transmitter
provide information on device status.
LED Color Meaning
Power Off Supply voltage is off or too low.
Green Supply voltage is ok.